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Insecticide Applications During the Pollination Period Do Not Adversely Affect Seed Yields of Loblolly Pine

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Three insecticides--Guthion® (azinphosmethyl), Pydrin® (fenvalerate), and Ambush® (permethrin)--were applied to catkins and to ovulate strobili of loblolly pines (Pinus taeda) at the time of maximum ovulate receptivity to determine their effects upon pollen viability, ovulate strobili survival, seed set, seed yields, and seed viability. Concentrations recommended for seed orchard use did not significantly reduce the number of pollen grains/ovule, in vitro or in vivo pollen germination, survival of ovulate strobili, number of developed seeds/cone, number of filled seeds/cone, germination of full seed, or cause an increase in abnormal seed germination. Operational applications of these insecticides to control the webbing coneworm (Dioryctria disclusa) should not cause adverse effects during this sensitive period of seed development in loblolly pine seed orchards.
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Document Type: Journal Article

Affiliations: USDA Forest Service, Southeastern Forest Experiment Station, Carlton Street, Athens, GA 30602

Publication date: 1985-11-01

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